Rotary engine.



T. J. LOFTUS.

ROTARY ENGINE. APPLICATION FILED AUG. 15. 1911.

1 276380. Patented Aug. 20, 1918.

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T. J. LOFTUS.

ROTARYENGINE.

APPLICATION FILED AUG. I5. i917.

1,276,380; Patented Aug. 20, 1918.

2 SHEETS-SHEET 2.

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:tillllt it "I Mitt THOMAS J. Lomus, or DASEELLA, cmimonmx, nssxsno'a or means is \skitiibh BELL, or OAKLAND, CALIFORNIA.

ROTARY ENGINE.

To all whom it may concern:

citizen 02G the Qtates, residing" (Janelle,

s oi California,

Xmyrovements m Rotary in the county of Shasta and State have invented new and useful Engines, of whlch the. ioiiovvingis a specification;

This invention relates to a rotary engine of the internal combustion, multi-cylinder type, such as shown in my .co-pending application, Serial No. 196,819, entitled Rotary engine, and'particularly to an engine which is aidapted to operate on' thetwo-cycle princ1p e, U

. One of theobjects of the present invention is to provide a rotary cylinder, internal combustion engine j operating on :the twocycle principle, in which, the crankcase and cylinders are mounted eccentricallywith relation to thecrank. shaft and in which both the cylinders and crank shaft revolve. Another object ofthe invention is to provide a crank shaft of novel construction to which tworevolutions are imparted while the cylinders makeone. revolution, and'al'so to pro vide. a rigid connecting rod for each piston which is adapted to alternately, move-into and out of engagement with the crankshaft, as will: hereinafter be. described, {to permit a perfect charging'and scavenging 'of' -the cylinders. Further objectsnwillshereinafter appear; 1",

, he invention consists'of the parts andthe construction and combination of parts as hereinafter more 7 fully described 7 and claimed, having reference to the accompanying drawings, in which I v Figure 1 is a entral,'longitudinal section through'the engine. 1

Fig.2 is a cross sectlon ofsame. 4

Specification of Letters Patent.

Application filed August 15, 1917.

Patented Aug. 20, 1918- Serial no. 186,306.

arranged to communicate with the interior of the crank case and an explosive mixture is delivered thereto, as Wlll herelnafter be described.

Surrounding the crank shaft 2 at one end of the crank case 4:, and secured by.means ofa bracket 8 to the bearing A, is a stationary head 9. This head is eccentrically positioned with relation to the crank case and'as it is cylindrical in shape,it can readilybe seen that the crank case, together with the cylinders, is permitted to revolve about same; packing'rings l0,of any suitable description being interposedbetween the c ank case and, the head 9 to form a tightjoint at this point to prevent leakage of an explosive mixture which is admitted through the head through a pipe 11 whichmay be connected with a'suitablesource of supply jas a carbureter or the like not vhere shown.

Formed integrally with the head ors'ecured thereto, as here'shown by means of screws 12 within the crank case, is a plate 13 in. which is formed a cam groove whichis divided'into two connected sections, indicated'at 14 and 15. each cylinder is a piston 16 and formed as an integral part of each piston is arigid connecting rod 17 on the lower end of which is formed ,half journal sections 18. These Slidably mounted i -i journals are separated togstraddle crank arms 19 securedupon the crank shaft and also to permit a perfect engagement, as will hereinafter be described, with a divided crank, pin 20 carried'by each crank. One

at 2l,fto support a pm or roller 22 which extends into the cam groove formed in the Plate 13. I

side'of'each journal member is extended, as

. A Ea h Ris'tOn, i th ri id connecting rod e5 inc; 1,276,380

7. A rotary cylinder. engine comprising a c zankcas'e, a plurality of. radially disposed cylinders secured to the crank case, a cylinder shaft journaled to rotate carryingthe crank case and cylinders, a crank shaftjournaled to rotate independently of the cylinder shaft and eccentrically positioned with relation thereto, a piston in .each cylinder, a rigid connecting rodon each piston, a stationary head forming a closure for one end. ofthe crank case, a cam member on said head havinga continuous groove formed therein, a pin oneach piston rod projecting into said groove, and said. groove consisting of: one small circular section struck about the center of the cylinder shaft and a large circular connected Section which is struck about the crank shaft and conforming with the sweep of the cranks, and a bearing member on each connecting rod adapted to engage the cranks while passing around the large circle of the cam groove.

8. A rotary clyinder engine comprising a crank case, a plurality of radially disposed cylinders: secured to the crankcase, a cylinder shaft journaled to rotate carrying the crank case and cylinders, a crank shaft journaled .to rotate independently of the cylinder shaft and eccentrically positioned with relation thereto, a piston in each cylinder, a rigid connecting rod on each piston, a stationary head forming, a. closure for one end of the crank case, a. cam member on said head having a continuous groove formed therein, a pin on each. piston rod projecting into said groove and said groove consisting of one small circular section having a constant radius butbeing; positioned slightly eccentric with relation to the cylinder shaft and a connected' larger circular section concentric with the. crank shaft and conforming with the sweep of the cranks, and a bearing j 9 The combination with the-cylinders of arotary cylinder engineand the pistons in member on each connecting. rod adapted to engage thecranks while passing around the large circle of the cam groove.

the cylinders, of a rigid connecting rod on each-piston, a pin on each rod, a stationary men-1berv having a cam groove formed therein into which the-pins project and. by which the'movement of the pistons is controllcdso that they remain at their innermostpositions during one half of the revolution of the cylinders and. are reciprocated once. during the other half of the revolution, and means for transmitting said reciprocal movement to revolve a crankshaft.

10. The combination with the cylinders of a rotary cylinder engine and the pistons in the'cylinders, of a rigid connecting rod on each piston, a pin on each rod, a stationary member having a cam groove formed therein into which the pins project and by which the movementof the pistons is controlled so hat y main.- at heir innerma tresi io durin one half of the ev it ion f the y nder and" e r cir c d ne i l fi'ns the erv halt? of. the evolution, cr n ha ieurnal'e to ro at and ec n r y positioned with relation to' theaxis of; roa i n ft e. y inders said rank af in one half-the number of'cranks: that there are cylinders, and abe'aring member on each connecting rod adapted to swing into engem nt wit me f he ra k the crank shaft during the reciprocal movement of the pistons to rotate the. crank shaft.

1-, In a t ry yl nd r ue'l e a p111? rality of radially disposed" revolving cylinders, a rotatable crank shaft. eccentricaliy positioned with relation to the axis ofrotation of'the clyinders, a plurality' 'of radially disposed crank armssecured on the crank shaft, a crank pin secured in the outer endof each crank. arm extendingoutwardly on each side of each crank arm, a reciprocating piston in eachcylinder, a rigid connecting rod oneach piston. having a divided bearing member formed on the inner end adapted to straddle the outer ends. of the crank arms to permit the divided bearings to engage the crank pins during a portion of a revolution ofthe cylinders and to permit the pistons to transmit two revolutions to the crank shaft during one revolution of the cylinders.

12. Ina rotary cylinder engine, a plurality of radially disposed revolving cylinders, a 'rotatable crank shaft eccentrically positioned with relation tO' the axis of' rotation of the cylinders, a plurality or. radially disposed crank arms-secured on the crank shaft, a crank pin secured in theo-uter end of each crank arm extending outwardly on each side 7 of each crankar n, a reciprocating piston in g each cylinder, a r g d connecting rod. on each piston having a divided bearing member formed on the inner end adapted tostraddle the outer ends of the crank arms to permit the divided bearings to engage the crank pins during a portion ofa revolution ofthe cylinders and to permit the pistons to transmit two revolutions to the crank shaft during one revolution of. thecylinders, a stationary member having a cam groove formed therein, and a pin on the inner end. of each pison conn ctin od proje n into e ment with said cam, said cam adapted to transmit one recipr cal movement to each piston during one revolution of the cyliners. V

13. In a rotary cylinder engine, aplurality of radially disposed revolving cylinders, a rotating crank shaft eccentricallypositioned with relation to the axis of rotation of the cylinders, a, reciprocating piston in each cylinder, means independent of the crank shaft 'controlling the reciprocal movement of the p stons, and a bearing member on the was Of eac risen. ad pt d w. nga

the crank shaft during a portion of the revoders, a rotating crank shaft eccentrically positioned With relation to the axis of rotation of the cylinders, a reciprocating piston in each cylinder, a bearing member on the in ner end of each piston, crank pins on the crank shaft, and means regulating the reciprocal piston movement to permit the bearing members on the inner ends of the pistons to engage the crank pins during a portion of the revolution of the cylinders and to move out of engagement with the crank pins during the remaining revolutionof the cylinders.

In testimony vvhereof I have hereunto set my hand in the presence of two witnesses.

THOMAS J; LOFTUS,

Witnesses:

C. F. HAMILT N, E. F. Prrrs.

Copies of this patentmay be obtained for live cents each, by addressing the Commissioner of Patents.

Washington, D. 6.

subscribing 2L0 T. l. LOFTUS.

ROTARY ENGINE. APPLICATION FILIED OCT. 1 6. 1917.

Patented Aug. 20, 1918.

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A TTORNE YS. 

